Donald Trumps net worth has grown about 300% to an estimated $4 billion since 1987, according to a report by the Associated Press. But the real estate mogul would have made even more money if he had just invested in index funds. The AP says that, if Trump had invested in an index fund in 1988, his net worth would be as much as $13 billion.
The S&P 500 has grown 1,336% since 1988.
Other billionaires net worths have beaten the stock markets growth in that time. Bill Gates, for example, saw his increase 7,173%, to $80 billion, since 1988. Warren Buffetts wealth grew 2,612% in the same time period, to $67.8 billion.